Senate Report 114-168: Coast Guard Authorization Act of 2015, Report of the Committee on Commerce, Science, and Transportation on S. 1611, November 30, 2015 [open pdf - 535KB]
"The USCG [U.S. Coast Guard] is tasked with providing maritime security, law enforcement, and prevention and response activities for more than 4.5 million square miles of ocean, 95,000 miles of coastline, 26,000 miles of commercial waterways, 361 ports, 3,700 marine terminals, and 25,000 miles of inland and coastal waterways-this is the largest system of ports, waterways, and coastal seas in the world. It is unique among the military branches for having a maritime law enforcement mission, with jurisdiction in both domestic and international waters, while also serving as a Federal regulatory agency as part of its mission set. [...] In 2014, the Commandant of the USCG (Commandant) stated that the USCG's mission demands were on the rise. Increasing activity in the Arctic and the destabilizing impacts of violence, corruption, terrorism, and drug trafficking in the Caribbean Basin, Central America, and Mexico continue to test the USCG's current capabilities. In order to meet these challenges, the USCG is in the midst of a major asset recapitalization that began in 2002. This effort will modernize the USCG's ships, boats, aircraft, and command, control, communication, computers, intelligence, surveillance and reconnaissance systems."
Senate Report 114-168; S. Rept. 114-168
U.S. Government Printing Office: http://www.gpo.gov/